ARTICLE · 24 FEBRUARY 2026

CRA EFILE Software Block Security Enhancement

Rotfleisch & Samulovitch P.C.

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The Canada Revenue Agency is introducing a significant EFILE software block security enhancement beginning in February 2026.

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David Rotfleisch

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The Canada Revenue Agency is introducing a significant EFILE software block security enhancement beginning in February 2026. This change will materially affect authorized EFILERS in Toronto and across Ontario who electronically file T1 individual income tax returns, and T3 trust income tax returns using the CRA's EFILE and ReFILE systems.

Under this new security framework, each EFILE account will be explicitly associated with one or more specific CRA-certified tax software products. Once the software block is in place, if a return is transmitted using a tax software product that is not linked to the EFiler's EFILE account, the return will be automatically rejected, and the electronic transmission will fail. In those circumstances, the EFiler must contact the applicable CRA EFILE Helpdesk to resolve the issue before filing can proceed.

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